Diamond
Carbon (C)
mineral
Category
Organic (Often Found By Beachcombers)
Browse organic (often found by beachcombers) specimens identified by the Rock Identifier community.
Learn about Organic (Often Found By Beachcombers) in the encyclopedia
View all →
Chert (Flint)
Chert (SiO2)
sedimentary
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Iron Slag (Industrial Byproduct)
Anthropogenic Vitrification Product/Ferrous Slag
Mineral-like Industrial Smelting Waste
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Serpentine
Antigorite/Lizardite/Chrysotile group, Mg3Si2O5(OH)4
metamorphic
Chert (Nodule)
Microcrystalline Silica (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone Pebble
Arenite (SiO2 complex)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert (Flint Nodules)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Chert (Chalcedony/Agate variety)
Silicon dioxide (SiO2)
sedimentary
Wishing Stone (Quartz-Veined Basalt)
Amygdaloidal Basalt with Quartz (SiO2) vein
igneous
Fossiliferous Limestone (Crinoidal Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
White Quartzite
Quartzite (primarily SiO2 - Silicon Dioxide)
metamorphic
Pegmatite containing Muscovite and Quartz
Granitic Pegmatite (SiO2 with KAl2(AlSi3O10)(OH)2)
igneous
River Quartz Pitting / Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Sea Glass
Amorphous Silica (SiO2) with various additives
Mineraloid (Anthropogenic)
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
Mineral
Azurite Malachite
Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2CO3(OH)2)
mineral
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Fossil Belemnite Guard
Belemnitida (Order), often Hibolites or Neohibolites spp.
fossil
Chert (Jasper/Agate variety)
Microcrystalline quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Fossilized Coral (Petoskey Stone / Favosites)
Favosites (extinct genus of tabulate coral)
sedimentary
Hematite Nodules (Moqui Marbles style)
Iron Oxide (Fe2O3)
mineral
Gold Flakes
Native Gold (Au)
mineral
Aventurine (Green Aventurine)
Quartz with Fuchsite Inclusions (SiO2)
Mineral
Fluorite and Rose Quartz
Fluorite (CaF2), Rose Quartz (SiO2)
Mineral
Brachiopod Fossil in Shale
Phylum Brachiopoda (often species of Order Spiriferida or Rhynchonellida)
sedimentary
Banded Agate
Agate (Cryptocrystalline Quartz, SiO2)
mineral
Black Tourmaline in Quartz Matrix
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Beryl (Emerald Variety)
Beryllium aluminum silicate (Be3Al2(SiO3)6)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
Mineral
Quartzite (Iron-stained River Rock)
Metamorphic Rock consisting primarily of Quartz (SiO2)
metamorphic
Agate
SiO2
Mineral
Carnelian (Orange Chalcedony)
Silicon dioxide (SiO2)
mineral
Golden Healer Quartz
Silicon Dioxide (SiO2) with limonite/hematite inclusions
mineral